Gcu 476 Remote Keypad - Garmin G1000 Maintenance Manual

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7.12

GCU 476 REMOTE KEYPAD

Original GCU 476 is Reinstalled
No software or configuration loading is required if the removed GCU 476 is re-installed. This
does not include units that were returned for repair as their software and configuration files are
deleted during the repair testing process.
New, Repaired or Exchanged GCU 476 is Installed
If a new, repaired or exchanged GCU 476 is installed; the correct software boot block and
certification gains must be loaded to the unit. Continue to the GCU 476 Software Loading
procedure. If the configuration fails to load, performing a boot block upgrade may be required.
Refer to the GCU 476 Boot Block Upgrade section if needed.
7.12.3 GCU 476 Boot Block Upgrade
The GCU 476 requires a boot block version of 3.01 or higher. If the configuration does not load
it is an indicator that boot block upgrade is required (GCUs with older dates of manufacture may
not have this version). If it was determined in one of the previous software loading procedures
that the GCU 476 does not have boot block version 3.01 or higher, follow this procedure to
update the GCU 476's software boot block.
It is critical for electrical power to remain on during the boot block update
procedure. Take steps to ensure that a 28 VDC ground power supply is properly
connected and is not disturbed during the update.
Obtain the required GCU 476 Boot Block loader card (SD Card,G1000,GCU476 BB v3.01
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GPN 010-00533-02) from Garmin or download it from the Garmin Dealer's Only Section of
their website and make a card.
Insert the boot block loader card into the top slot of the PFD.
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Apply system power and place both displays in Configuration Mode.
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After the SYSTEM STATUS page appears on the PFD, use the small FMS knob to turn to
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the SYSTEM UPLOAD page.
Activate the cursor and select GCU476 BB in the AIRFRAME field. Press the ENT key. The
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cursor will drop down to the FILE field.
Rotate the small inner FMS knob and select GCU Boot Block 3.01. Press the ENT key.
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Verify that the SOFTWARE box is checked (see screen shot). Press the LOAD softkey. The
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GCU boot block will begin loading. Do not remove power while the update is in process.
G1000 System Maintenance Manual
190-00907-00
NOTE
Page 7-39
Rev. B